I think the rings thingy is something about 360 degrees or a full circle. Maybe a circle of protection from satan by alah. Oh my I have been reading too much of this stuff... see link...
Simple. We have to complete a circle. We have to form a Dairah. Not in the physical sense, but in the spiritual sense. How can that be true? Look at the Tasbih, or rosary or 'worry beads'. Do we not start at one end and complete a full circle? Even while we are doing Zikr Allah, we are forming circles. The Zikr Allah forms a Dairah ('ring') around the one doing Zikr. Shaytan (Satan) is kept outside this Dairah (circle).
http://www.meem.freeuk.com/Dal.html
That makes sense. Thanks Davey.